a. a little

Đầu kiện: \(a>0;a\ne1\)

\(P=\left(\dfrac{4a}{\sqrt{a}-1}-\dfrac{\sqrt{a}}{\sqrt{a}\left(\sqrt{a}-1\right)}\right).\dfrac{\sqrt{a}-1}{a^2}\\ =\dfrac{4a-1}{\sqrt{a}-1}.\dfrac{\sqrt{a}-1}{a^2}\\ =\dfrac{4a-1}{a^2}\)

b.

\(P=3\Leftrightarrow\dfrac{4a-1}{a^2}=3\\ \Leftrightarrow3a^2-4a+1=0\)

\(\Rightarrow\left[{}\begin{matrix}a=1\\a=\dfrac{1}{3}\end{matrix}\right.\)

So với đầu kiện bài toán ta có a = 1/3 thõa mãn bài toán.

Minh chú ý là Điều kiện, ko phải Đầu kiện nhé

1 B

2 A

#hoctot

doesn't work as responsibly as Mr Robin

1 Dan is at home with his family

2 there is a big yard in front of Mike's house

3 is your apartment opposite a bakery?

4 there are many clubs for you to join

5 Thieu and Tuong are two characters in Yellow Flowers on the Green Grass

1 is not as easy as this one

2 doesn't sing as beautifully as her

3 is the most intelligent person in my group

4 doesn't drive as carefully as him

1, This task is easier than that one

-> That task is more difficult than this one.

2, Hoa sings more beautiful than her sister

-> Hoa's sister sings as not beautiful as her.

3, No one in my group is more intelligent than Minh

-> Minh is the most intelligent person in my group.

4, He drives more carefully than his brother

-> His brother drives more carelessly than him.

1 C

2 C

3 C

4 D

5 B

1.c

2.c

3.c

4.d

5.b

C

B

magnificent

magnificent